    <%@ page language="java" contentType="text/html; charset=utf-8" %>  
    <%  
        String nodes = "[{ id: 1, text: 'A leaf Node', leaf: true },{ id: 2, text: 'A folder Node', children: [{ id: 3, text: 'A child Node', leaf: true }] }]";  
        out.print( nodes );  
   %>  